Transactions with Affiliates (Details) (USD $)	3 Months Ended			9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2008	Sep. 30, 2011	Dec. 31, 2012
Related Party Transaction [Line Items]
Reinsurance assumed risk	$ 4,460,000,000
Derivative fair value reported as labilities	(335,000,000)				38,000,000
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Assumed reinsurance liability					0
Earned premiums	3,000,000	2,000,000		12,000,000
Payout annuity			2,200,000,000
Payout annuity, period			12 years
Hartford Life Insurance K.K. (HLIKK)
Related Party Transaction [Line Items]
Assumed reinsurance liability	1,800,000,000				2,100,000,000
Hartford Life and Annuity Insurance Company (HLAI) | Hartford Life Liimited Ireland (HLL) | Guaranteed Minimum Death Benefit [Member]
Related Party Transaction [Line Items]
Assumed reinsurance liability	4,000,000				4,000,000
Reinsurance assumed risk	28,000,000				42,000,000
Hartford Life and Annuity Insurance Company (HLAI) | Hartford Life Liimited Ireland (HLL) | Guaranteed Minimum Accumulation Benefit and Guaranteed Minimum Withdrawal Benefit [Member]
Related Party Transaction [Line Items]
Derivative fair value reported as labilities	1,000,000				0
Hartford Life and Annuity Insurance Company (HLAI) | Hartford Life Insurance K.K. (HLIKK) | Guaranteed Minimum Death Benefit [Member]
Related Party Transaction [Line Items]
Assumed reinsurance liability	7,000,000				22,000,000
Reinsurance assumed risk	1,300,000,000				2,700,000,000
Hartford Life and Annuity Insurance Company (HLAI) | Hartford Life Insurance K.K. (HLIKK) | Guaranteed Minimum Income Benefit [Member]
Related Party Transaction [Line Items]
Derivative fair value reported as labilities	$ 1,400,000,000				$ 1,800,000,000